I am not going to be sending anyone diagrams. The breech is extremely simple, and anyone with half a brain should be able to figure out how to build it. If you can't, then you are too incompetent to be building cannons in the first place.

The barrel is 1/2" SDR 21, which has an inside diameter of 0.69", a slightly better fit than 3/4" CPVC and 3/4" Sch 80.

I have taken it to 120psi, and that is all I ever intend to reach. The sprinkler valve is only rated to 125psi.

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